Il8 ALLEN 



coeliac, intestinal artery^,) is given off to the right (fig. 37 ; 

 Int. A. (2)); passing caudad to the right of the corresponding 

 vein it crosses under the ventral branches of intestinal vesselS(i), 

 the spleen, and the dorsal brandies of intestinal vessels, and 

 continuing caudad between the anterior and posterior horns of 

 the iliac loop, supplies both of them. The cceliac artery proper 

 separates into the right and left ^yloi'ic ccuca arteries. The 

 former (fig. 37 ; R.Ca^.A.) passes around the pylorus on p^'loric 

 cajcum^T), and bifurcates into a dorsal and a ventral branch : 

 the ventral branch gives off a large branch which crosses under 

 this caecum, and continues caudad between cascum^j) and 

 csecum(2), giving off branches to each. The left pyloric cceca 

 artery (fig. 37 ; L.Ca^.A.) passes to the left of the pylorus be- 

 tween c^ecum^^) and cjecum^-,), giving off branches to each. 



Portal System. — As in Schastodcs the 2 portals unite in 

 forming a common portal, that breaks up into numerous 

 radicals. 



The right portal (fig. 37 ; R.Por.V.) has its origin from the 

 right gastric, and intestinal vein(,). Intestinal vein ^^^^ (fig. 37 ; 

 Int. v., J,) arises from a dorsal and a ventral branch. The former 

 (fig. 37 ; Int.V.(j^)) arises from the dorsal side of the rectum, 

 and runs cephalad, parallel to the corresponding artery, but 

 below it; receiving branches from the posterior end of the 

 intestine and anterior horn of the iliac loop, it crosses intestinal 

 vessels (2) and passes above and to the right of the spleen from 

 which it receives the splenic vein {^\'-^. 37 ; Spl.V.). Directly 

 in front of the spleen the dorsal intestinal vein receives the 

 ventral intestinal branch (fig. 37 ; Int.V.^j,,)), which arises from 

 the lower side of the rectum and passes forward along the ven- 

 tral side of the corresponding artery. Curving around tlie ven- 

 tral and left side of the spleen it receives two branches ; the first 

 one, which is the posterior gastric vein (fig. 37 ; P.Gas.V.) 

 arises from the cardiac end of the stomach, and runs along in 

 front of the posterior gastric artery ; while the anterior vessel 

 has its source from two branches, one coming from between 

 pyloric ca'ca^,,,^^,, ,2)» '^^cl the other from ca'cum .,,. After 

 receiving these branches the ventral intestinal branch crosses 

 over intestinal vessels ^j)* '^"d in front of the spleen unites with 



